Colloquium

Upcoming Colloquium

Spintronics: Ultrafast Spin Currents at Room Temperature
Dr. Thomas Gredig, CSU Long Beach

February 6, 2023
11:00am in HSCI-105

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Thomas Gredig

Electronics based on the charge of the electron has widely revolutionized life since the introduction of the point-contact transistor about 70 years ago. Later, it was proposed that electron charge currents can produce perpendicular spin currents. Over the last two decades, interest in this spin Hall effect has exploded, since it was realized that even without scattering processes, spin-orbit coupling gives rise to spin-dependent transport.

Spin generation has often relied on ferromagnetic materials. The ferromagnetic stray fields, however, limit the miniaturization needed to build more dense electronics; additionally, the spin flip times in ferromagnets are relatively slow. Both limitations are overcome with the use of antiferromagnetic materials. Therefore, good methods to generate, propagate, and detect spin currents in antiferromagnets, are needed. We will present our findings towards this latter goal.

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atomic force microscopy of spintronic device, and anisotropic magnetoresistance graph
Fig. Left: Atomic force microscopy image of spintronic device. Right: Anisotropic Magnetoresistance measured across different geometric configurations shows small phase and amplitude differences.

The Colloquium is a unique opportunity for students to learn about new developments in physics and what physicists do after they graduate. Hosted by the Department of Physics and Astronomy at California State University Long Beach, the weekly meetings invite guests from universities, research laboratories, and industry to present and discuss current topics in physics. All students are encouraged to attend for a well-rounded experience and training in physics.

Colloquium Coordinator

For information and suggestions about the colloquium please contact the colloquium coordinator:

Dr. Zoltan Papp
Zoltan.Papp@csulb.edu

Schedule

The first Colloquium for Spring 2023 is on Monday, January 30. Additional details about colloquia will be posted as information becomes available.

Upcoming Colloquia
Date Title Speaker and Affiliation
February 6, 2023 Spintronics: Ultrafast Spin Currents at Room Temperature Dr. Thomas Gredig, CSU Long Beach
February 13, 2023 (topic: neutrino-nucleon interactions) Samuel Hedges, Lawrence Livermore National Lab
February 20, 2023 TBD TBD
February 27, 2023 TBD TBD
March 13, 2023 (topic: light-matter interaction) Kalman Varga, Vanderbilt University
March 20, 2023 (topic: sabbatical leave lecture) Jiyeong Gu, CSU Long Beach
March 27, 2023 (topic: baryon spectroscopy) Willibald Plessas, University of Graz, Austria
April 3, 2023 (topic: inverse compton lasers) Ferenc Raksi, UC Irvine
April 10, 2023 (topic: spooky action) Tibor Rakovszky, Stanford University
April 17, 2023 (topic: TAE fusion energy) Abbey Goodman
April 24, 2023 (topic: topological quantum matter) Sarah Grefe, Los Alamos National Lab
May 1, 2023 Student Presentations Students, CSU Long Beach

Previous Colloquia

Previous Colloquia
Date Title Speaker and Affiliation
January 30, 2023 Shedding Starlight on the Galaxy's Past Dr. Joel Zinn, CSU Long Beach

The Colloquium Archive has the Colloquia from previous semesters.


Sponsors

We acknowledge with gratitude donations and support from the following present sponsors:

  • H.E. and H.B. Miller and Family Endowment
  • Benjamin Carter
  • American Physical Society
  • Anonymous

We also acknowledge with gratitude our past donors: The Forty-Niner Shops, Inc., The Northrop Grumman Foundation, Sandra Dana, Anonymous.

If you wish to support the Colloquium, please contact the colloquium coordinator or the department chair. Thank you!